Apparatus and method for sealing and cutting tissue

• US 20050101965A1
• Filed: 11/14/2001
• Published: 05/12/2005
• Est. Priority Date: 09/09/1997
• Status: Active Grant

• Current Assignee: Sherwood Services AG
• Original Assignee: Sherwood Services AG
• Inventors: Ryan, Thomas Patrick
• Granted Patent: US 6,932,810 B2
• Time in Patent Office: Days
• US Class Current: 606/96
• CPC Class Codes: A61B 18/1442 Probes having pivoting end effectors, e.g. forceps
• CPC Class Codes: A61B 2018/00601 Cutting
• CPC Class Codes: A61B 2018/0063 Sealing
• CPC Class Codes: A61B 2018/00702 Power or energy
• CPC Class Codes: A61B 2018/00875 Resistance or impedance
• CPC Class Codes: A61B 2018/145 wherein the effectors remain parallel during closing and opening

Abstract

An axial elongate bipolar tissue sealer/cutter and method of use by a surgeon for electrosurgery on tissue has a handle. A chassis on the handle extends axially for axial movement. A tube may move axial relative to the chassis. An effector on a distal end of the chassis first contacts tissue with axial movement. The effector provides bipolar electrosurgery. A member extending from the distal end is opposite the patient end of the tube. A part on the member is transverse to the axis to conduct electrosurgery. First and second bipolar electrodes on the effector and part are electrically isolated. A generator for bipolar electrosurgery supplies the electrodes. An activator is movably supported on the handle connects to the tube and/or chassis to axially move the patient end and its effector relative to the part. Tissue and bodily fluid therebetween are sealed or cut through application of compression and bipolar electrosurgery between the first and second electrodes. The effector and the part have complimentary sealing or cutting surfaces for partial mating engagement upon axial movement toward one another. The effector and the part can be removably attached to the distal end or member, respectively. The partial mating complimentary surfaces may be normal or skewed relative to the axis and may be curvelinear, flat, parallel, circular, elliptical, triangular or have at least one conjugating rib and slot. A method of use has the steps of holding and manipulating the sealer/cutter, moving the chassis relative to the tube, positioning the effector and the port to contact tissue, along the axis coupling bipolar electrodes to the effector and part, electrically isolating the electrodes, selectively coupling the generator to the electrodes for supplying bipolar electrosurgery. Supporting the activator for moving axially relative to one another, the patient part and the effector so tissue therebetween is sealed or cut by applying compression and bipolar electrosurgery across the first and second electrodes are steps.

Claims

1-23. -23. (canceled)

24. A bipolar electrosurgical instrument for sealing and cutting tissue, comprising:

a chassis having a longitudinal axis defined therethrough and first and second end effectors attached thereto, one of said first and second end effectors being movable along said longitudinal axis relative to the other of said first and second end effectors from a first position for positioning tissue therebetween to a second position for grasping tissue between said first and second end effectors, wherein said first and second end effectors include complimenting vessel sealing electrodes which partially matingly engage one another, said electrodes adapted to be connected to a source of electrosurgical energy such that the electrodes are capable of sealing and cutting tissue disposed therebetween upon activation of said electrodes;

an activator for moving said end effectors from the first to second positions;

a sensor for measuring the impedance across the tissue held between said end effectors; and

means for selectively applying electrosurgical energy from an electrosurgical energy source to said end effectors in response to the impedance measurement across the tissue from said sensor.

25. A bipolar instrument according to claim 24 wherein the activator includes a handle.

26. A bipolar instrument according to claim 24 wherein at least one of the first and second end effectors is selectively removable from the chassis.

27. A bipolar instrument according to claim 24 wherein the first and second end effectors include vessel contacting surfaces which partially matingly engage upon movement of the end effectors from the first to second positions.

28. A bipolar instrument according to claim 27 wherein the vessel contacting surface of the first end effector has a first cross section and the vessel sealing surface of the second end effector has a second cross section which compliments the first cross section to engage tissue therebetween.

29. A bipolar instrument according to claim 27 wherein the vessel contacting surfaces of the first and second end effectors cooperate to seal tissue disposed between the end effectors upon application of electrosurgical energy.

30. A bipolar instrument according to claim 27 wherein the vessel contacting surfaces of the first and second end effectors cooperate to cut tissue disposed between the end effectors upon application of electrosurgical energy.

31. A bipolar instrument according to claim 24 wherein the first end effector includes a first electrode and the second end effector includes a second electrode.

32. A bipolar instrument according to claim 31 wherein the second electrode is electrically isolated from the first electrode.

33. A method of applying electrosurgical energy to tissue comprising the steps of:

providing a chassis having a longitudinal axis therethrough and first and second end effectors attached thereto, one of said end effectors being movable along said longitudinal axis relative to the other of said first and second end effectors from a first position for positioning tissue therebetween to a second position for grasping tissue between said first and second end effectors, wherein said first and second end effectors include complimenting vessel sealing electrodes which partially matingly engage one another, said electrodes adapted to be connected to a source of electrosurgical energy such that the electrodes are capable of sealing and cutting tissue disposed therebetween upon activation of said electrodes;

moving said end effectors from the first to second positions to engage tissue therebetween;

measuring the impedance across the tissue held between said end effectors; and

selectively applying electrosurgical energy from an electrosurgical energy source to said end effectors in response to the impedance measurement across the tissue.